Physical laboratory apparatus.



P-ATENTBD A9318; 1903.

. L. E. KNOTT.

PHYSICAL LABORATORY APPARATUS.

APPLIGLTION FILED NOV. 23, 1907.

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' No. 885,763. PATENTED APR. 28, 1908.

PHYSICAL mam-men APPARATUS.

APYLIOATIGH FILED NOV. '23, 1907.

3 SHEETS-$5331 2.

ilfiiflllill) STATES PATENT OFFICE.

No. dog, I

USETTS, A

Specification of Letters Patent.

Application filed November 23, 1997. Serial No. 03,613.

SSIGNOR Till Lv E. KNOTT APPARATUS COM A JORPORATION OF MASSACHUSETTS.

Patented. April 28, 1908.

/ i2; may soncmz:

W! ms 1, Loom E. KNOTT, s .lmlod States, molding; at Boston, windy m bud'olli, ond'Stoto of Mussog :rlms limo irwontodnn Illwsi nl La lJOiZBi m5 l'ol lowing dos ho mono:opanying lion, liko lCliK'iiS on ii i pa r'y Apparatus, of which l droning representing lliis II'YW-filfifiifl rolstes to physical labors, apps ins, and ospoololly to a dovioo good to 15; nstz'oto and domonstmto to a 7 on heroin omlwdisd in on. a no oi the physical loboi'siory is and is i I lls wimprovo piece oi sppsrafzzs of this typo by .liy'iil" ills oonsnno ion i-lssreoi' in s cl; W41) n amnion film omit insnniszom and in swim i isle? to dsnmnsiPolo to no Maid dyn am 0.

as imroin illustroood com-- piece, is iiold magnet demon i fwd ilzoroby, on armature momsup ed. by the: lasso, and a lHf'iISlr. suluining the brushes which snx d nm'mluro member. (iii-monk o! llao apparatus aresopsmblo from who?" so that either the immature momllor, {lo i'iold magnets oi." the brush hold can l'w sopondol ronmvod ii'om tho how, ll us moldng it possible for the stw duds 2o sogmmlv or dolorlu from the others any who of tho four principal olomonis of tho :fawlvo and Hum ermmino it in, a W Wlii no? lio douo 1? Han 'woi's i; tho! i, not

7 Eli) l1 miller.

.. one omb z=dimoni of my nowl few lmprovomont in I mon, 111 (mnnootion with, drawing, 1s a, specifics isiruciion and operation of a arning :tom'monly known as tho Gilley' mow mzwhmo", "WlllOll is an apparatus Those fourv from the other elements of the device; Fig.

4 is s plan View of the .base; Fig. is a plan view of the armature element," Fig. 6 is a bottom plan View of the armature element;

, Fig. 7 a vertical soot-ion through the or- 60 mature element' and the pivotal pin on which it is supnolted on tho lino w 1:, Fig.

1; Fig. 8 is a p on View of the brush holder with a. portion thereof broken out.

l The boss of tho spgmratus is l 3 and l have hsreinsliown it as substan I tiolly T-shapsd, it having the two laterallyl exionding arms 4 and 5 and the centrally I situated arm 6 The, laterally-extending l zmns and 5 have i/llfi roarwardly-extending 7O gvrojootions 3 ativhoir ends which projections novo the .i'eot 8 extending therefrom. The

forwsrdly-extending arm 6 also has the foot lion its under side which foot is preferably adjustably secured to tho 3,1111 so as to per- 7 mit the imso no no leveled up. The arm 6 of pivotal pin 10 on which the armature element 11'. is rotatably mounted. in the designated by ,5

prosont fOlHl. of tho invention this {)ivoisl 80,

pin (or, ad by the shank l2 oft 19 foot, I 9, the shank of the foot or rest being SC-WYWilllfliillill into tho arm 5, as above dosoiiliod. Tho boss 3 has also rising thorono two posts 13 on which the field magnet 5 olsi'nont ilis sustained. Said. fiold magnet oloinoni; may have any usual or suitable o011- sirnotion, and as shown, it comprises the two arms 15 having thousual pols pieces 17 shaped to portiolly embrace the omoture element. Said arms are oonnootod by a 0023s which susioins the usual iiold winding 1 (i. 18 ore binding posts of any mproprioto ocmsti'notion for connecting the field Winding to ills circuit. The field elol'nonb i is 21.1 ranged to ho sustained on the posts 13, the arm" 15 of said Hold element resting on top of tho gntots, as shown in Fig. 2, and said olemm being domolmbly hold in .position on the posts by snitsblo clamping screws 19 10 who; 'llnoogll the arms 15 ond scIoW osi-s I l l i has extending upwardly from the end therel I l l i omont oomprisos a holder other suitable insulating L 1 wlziol'l holder the armature wincll0 Eng iii of unysuil-sble (diameter is support-ed. in lilo present embodiment the armature 1' shown. a (lnnnmo ring armature, and the holdor 20 is provided Witl'in suitable flan o l 220 on. which tho ring 2]. is sustained, sold 11.

ring being held in place on the flange by suit- I able clips 22 which are secured in position by screws 23. The commutator segments of the armature are designated 24 and are secured 5 to the under side of the holder or plate 20, as seen in Figs. 2 and 6, and these armature segments are connected to the coil of the Gramme ring through screws or binding posts 25.

The armature member sustained on the pivotal pin 10 in such a [hat said arma ture member can be readily lifted from the pin and separated from the other elements of the apparatus; For thus sustaining it, I rovide the armature element with the busl iing 27 which extends into a central aperture in the holder .20 and which has screw-threaded to its upper end the bearing member 26, which bearin member rests on the upper end of the pivotzil pin 10. With this construction the center of gravity of the armature member is below the point of su )port between the bearing member 26 and the pivotal pin 10, and therefore the armature member will rest steadily on the pivotal pin and be capable of turning freely thereabout. The bushing 2'? acts also -as a sort of steadying bearing to assist in maintaining the armature in its correct position. 'I his hearing- 30 member is insulated from the commutator segments 24 by the holder 20 and an air gap.

30 designate the brushes which are adapted to have engagement with the commutator segments. These brushes are sustained by a brush holder 31 of insulating material which is loosely mounted on the shank portion 32 of the pivotal pin. Said brush holderis provided with usual binding posts 3-1 to which the wires of the main circuit are connected,

and it is also provided with the clamping screw which 18 adapted L clamp the holder in anyadjustcd position on the shank portion 32. Y

It will be observed from the above description that the armature element is so constructed that it can be readily lil'tcd from the pivotal pin and examined by the student swithout disturbing any of the other parts of the apparatus, and moreover the manner or supporting the Grammc ring on the holder '20 is such that m2; consl ruction and working of of the apparatus can be readily obscrved.

' The manner of supporting the lield element on the basc is such that it can be removed from the base without in any way disturbing the armaturc element or other parts of the apparatus. The brush. holder can also be readily detached from the pivotal pin after the arm-aturc mcmbcr has been removed.

All the parts of the apparatus can be easily examined by the student either in their connection wlt'h the other parts'of thiapparatus or separately.

IIaving fully described my invention, what I claim as new and desire to secure by Letters Patent is 1-. In a device of the class described, the

combination with a base having two posts and a pivotal pin rising therefrom, of afield element and its winding resting on said posts and detachably connected thereto, and an armature rotatably sustained by said pivotal in and removable therefrom independently of the field element.

2. In a device of the class described, the combination with a T-shaped base having two posts rising from the end of the transverse arms and a pivotal pin risingfrom the end of the central arm, of an armature member rotatably mounted on said pivotal pin, and a field member resting on said posts and detachably connected thereto by screws.

In an apparatus of the class described, the combinatlon with a base having two posts and a pivotal pin rising therefromyof an armature element having a pin-receiving bushing provided at its upper end with a bearing to rest on the end of the pin, a brush holder loosely surrmuuling said pin, and a field member resting on the posts and detachably secured thereto by screws.

4. In an apparatus of the class described, the combination with a base having two posts and a pivotal pin rising therefrom, of a brush holder loosely surrounding said'pin, an armature member rotatably sustained by said pin, and a field member resting on the posts and secured thereto by screws.

5. In an apparatus of the class described, the combinatlon with a base having two posts rising therefrom, a field member resting on said posts and detachably secured thereto, a pivotal pin member provided with a scrcvwthreaded shank scrmwthreaded to said base, said pivotal pin member extending above the base and provided with, ortions of diil'erent diameters, a brush ho der loosely surrounding the portion of said pin of larger diameter, and an armature member sustained by the upper end of said pin.

6. In an apparatus of thoclass described,

the combination with a base having two posts and a pivotal pin rising therefrom, 5 an armature member rotatably sustained by said pin. and a hold member resting on the I posts and detachably secured thereto. said 'iield member and armature men'iber each be zmg removable from the apparatus without disturbing theother. In testimony whereof, I have signed my name to this specification, in the presence of twb subscribing witnesses. LOUIE .E. KNOT'l.

- \Yitncsses:

Roman E. S'rnvnxs, J. Farms. 

